Wireless Charging Control for Eco-Friendly Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless charging technology for eco-friendly vehicles is sensitive to distance and relative position between coils, leading to inefficient charging due to external noise and uneven battery cell charging.
Innovation Solution
An eco-friendly vehicle system that includes a wireless power receiver, memory for state information storage, and a controller to manage charging order based on state of charge (SOC) and state of health (SOH) of battery cells, using cell balancing units and a comparator to optimize charging efficiency and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging using magnetic induction is used, then charging convenience is improved, but charging efficiency deteriorates due to sensitivity to distance and position
Solution Approach 1:
The patent implements dynamic adjustment of charging parameters by sequentially activating cell balancing units based on real-time SOC measurements. The controller dynamically determines charging order and activates balancing units in sequence, allowing the system to adapt to changing battery states during wireless charging, thereby maintaining efficiency despite position variations.
Solution Approach 2:
The patent changes operational parameters by adjusting the activation sequence of cell balancing units based on SOC levels. By varying which balancing units are activated and in what order, the system optimizes charging efficiency for wireless charging conditions, addressing the efficiency degradation caused by distance and position sensitivity.
2Speed
If wireless charging is used, then charging speed is improved, but charging uniformity deteriorates due to external noise
Solution Approach 1:
The patent segments the battery charging process by individually controlling each cell balancing unit based on its specific SOC level. Instead of uniform charging, the system divides the battery pack into individual cells and manages them separately through sequential activation of balancing units, ensuring uniform charging despite external noise interference.
Solution Approach 2:
The patent applies local quality control by activating specific cell balancing units based on their individual SOC states. Each balancing unit is activated in sequence according to its specific charging needs, allowing localized optimization of charging uniformity for each cell while maintaining overall charging speed.
3Loss of time
If battery cells are charged simultaneously, then charging time is reduced, but charging balance deteriorates
Solution Approach 1:
The patent performs preliminary assessment of SOC levels for all battery cells before initiating charging. Based on this preliminary information, the controller pre-determines the activation sequence for cell balancing units, ensuring that cells with lower SOC are charged first. This preliminary planning enables balanced charging without excessive time loss.
Solution Approach 2:
The patent implements periodic activation of cell balancing units in a sequential manner rather than simultaneous operation. The controller periodically activates the next balancing unit in the sequence based on SOC levels, maintaining charging balance while minimizing total charging time through efficient periodic operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves wireless charging efficiency by prioritizing battery cells with lower SOC and adjusting threshold voltages based on SOH, ensuring even charging and reducing external noise, thereby enhancing battery management and overall vehicle performance.
Implementation Method 1
a wireless charging system using a magnetic induction phenomenon is used
Implementation Method 2
including a comparator configured to select a frequency of the received electric power
Data Source
AI summary
An eco-friendly vehicle using a charging control method improves the wireless charging efficiency and efficiently manages the charge/discharge of a battery of the vehicle. The eco-friendly vehicle includes: a wireless power receiver to wirelessly receive an electric power from an external charging device; a memory to store state information of each of a plurality of battery cells; and a controller to control a charging order of each of the plurality of battery cells by using the state information stored in the memory when an engine of the vehicle is in an off state.